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Debugging Launchpad
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This page collects tips that might make debugging Launchpad a little easier.  They're presented in no particular order -- please add yours!


Debugging stories/pagetests
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Debugging stories (a.k.a. pagetests) can be kind of a pain because they build up state as they go.  So if a test fails down deep in the doctest, and you want to see what the page really looks like at that point, you'd normally have to manually click through each step in the doctest until you get to the place that's broken.

But there's an easier way!

Just add this at the point where your pagetest is failing::

    >>> stop()

This is just a convenience wrapper around ``pdb.set_trace()`` except that it also redirects stdout back to your console.  When your pagetest hits this line, you'll be dropped into the debugger.  Now, go to a different shell and type::

    % make LPCONFIG=testrunner run

This starts up the appserver, except that it will use the ``testrunner`` configuration.  What's cool about that is that this configuration attaches to the same database as the pagetest you're now stopped inside of.  Meaning, all that state your doctest has built up, is available to your browser.  So just hit the URL of the page that your doctest is failing on, and see it in all it's wondrous, albeit borked, glory.